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The air in an air brake system is the "fluid" to activate the brake, much like brake fluid activates the brakes in your car. One difference is that you are not pushing air down the lines when you step on the brake pedal, instead you are releasing a metered amount of air, or "application pressure" from the reservoir, through the treadle valve (brake pedal/valve) to the brake chambers, to apply the brakes. Air also releases the parking brake, as the parking brake is always in the on mode, until you push a valve on the dashboard, sending compressed air to the parking brake chambers, releasing them. The parking brakes are spring powered, and the air over rides these springs.

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Q: What does air in brake line do to the brakes?
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Related questions

Why on a 1985 jeep the brake peddled goes to the floor?

More than likely, there is air in the brake line or a leak in the line. Go to a mechanic and have the brakes "bled". He'll know what you are talking about. It's fairly inexpensive to do. Bad brakes, bad master cylinder, broken brake line, low brake fluid.

Do air brakes use brake fluid?

No, they use air pressure or actually the lack of air pressure to stop the vehicle. The brakes are fully on until pressure builds up in the tank releasing the brakes. When you push the brake pedal this removes air from the system and applies the brakes.

How do you repair a leaking brake line?

You must remove it, fit a new one and then bleed the brakes to remove the air in the new line.

Why is it hard to press down your brake pedal on a ford ranger?

more than likely you have air in brake line and need to bleed brakes

What are brake chambers?

On an air brake system, the brake chamber is what actuates the air brakes... it converts air pressure to mechanical force, either turning an S-cam (on foundation brakes), or actuating a caliper (on disc brakes).

What is a service line in a tractor trailer?

It supplies air to the service chambers of the brake chambers in order to engage the brakes.

Is there any type of tape to stop brake line leaks?

No, and it's not really a good method to go about, whether for hydraulic or air brakes. You really need to replace the brake line.

Why is brake bleeding required for braking repair?

You have to bleed the brake lines because if there is any air in the lines the brakes will fail. If there is any air in the brake line, when you step on the peddle the air will compress and not transfer the energy to the brake caliper or drum and not stop the car.

Chevy Venture brake line leaking?

When a brake line is leaking on the Chevy Venture the brake line should be replaced as soon as possible. A leak, however small, can cause hydraulic fluid to escape the brake line which will cause a loss in brake pressure. The brakes should be bled of air after the new line is put in to remove gaps in brake pedal pressure.

Brake pedal almost goes to the floor before it engages the brakes?

Probable causes: Low or no fluid in reservoir; Worn brake pads/shoes; Air in brake lines; Leaking brake line.

How effective are air brakes verses a standard set of brakes?

Air brakes are just as effective as a standard set of brakes. The advantages to air brakes are that you do not have to worry about leaking brake fluid.

Do you have to bleed all line for brakes if you replaced a brake line?